New to this lovely looking place, but I have to make my first post a cry for help lol

I recently modded my iPhone from a black 3GS to an all White 3GS, I must say it looks BEAUTIFUL! and I thought everything went well considering I had never done this before.
But it's now been about 2 weeks since I did and I ave gone to use the Camera doesn't appear to be working was working before I did the change but not now, the app launches but the shutter doesn't open and after about 2 minutes it closes and goes back to the normal dashboard.

Any suggestions on problems? fix's? things I need to double check? be nice to know what I might have missed etc before I go opening the phone back up, as like I said I'm a newbie to all this, thank in advance to everyone who helps out.